Mechanism for measuring distances especially thread diameters

Abstract

The object to be measured (2) is placed on carrier (1). Measuring pins (7,8) can be adjusted roughly in terms of height after loosening screws (11). Sliding carriages (5,6) are guided movably by spherical guides in measurement support members (3,4) perpendicularly to the direction of measurement. Measuring pins (7,8) located in support members (3,4) which are provided with handles (13) and which are connected with sliding carriages (5,6) by means of leaf springs (14). If the laterally adjustable support member (4) is moved into the measuring position, the sliding carriages (5,6) with their measuring pins (7,8) can, within the limits of leaf springs (14), be freely centered in the pitch of the thread to be measured (2a) thus providing the ideal prerequisites for correct measurement of the thread diameter.

I claim: 
     
       1. Mechanism for measuring distances particularly thread diameters, comprising a carrier (1) for receiving the object to be measured, two measuring support members (3,4) attached to said carrier, measuring pins (7,8) mounted in each of said measuring support members, said pins including measuring inserts (9), at least one of said measuring support members movably mounted for measurement purposes opposite said carrier in a direction corresponding to the measurement direction, characterized in that said measuring pins (7,8) positioned in said measuring support members (3,4) are movable perpendicularly to said measurement direction, said measuring support members (3,4) including adjusting members (12,13) mounted therein to guide said measuring pins (7,8) into an approximate measurement position, spring members (14) connecting said adjusting members (12,13) with said measuring pins (7,8) so that, during a measurement operation, they permit a centering leeway of said measurement inserts (9) into the correct measuring position against the spring force of the spring members (14). 
     
     
       2. Mechanism for measuring distances according to claim 1, wherein said measuring pins (7,8) are positioned in said measuring support members (3,4) by means of roller guides (10). 
     
     
       3. Mechanism for measuring distances according to claim 2, wherein said measuring pins (7,8) are mounted in longitudinally adjustable sliding carriages (5,6) which in turn are movably positioned in said measuring support members (3,4). 
     
     
       4. Mechanism for measuring distances according to claim 3, wherein said adjusting members (12,13), positioned in measuring support members (3,4) are braked so that they will be retained in the adjusted position. 
     
     
       5. Mechanism for measuring distances according to claim 4, wherein the weight of said measuring pins (7,8) and of the sliding carriages (5,6) connected with them, is balanced out by correspondingly arranged springs (17).